Full Description

Digital Network Synchronization Plan

ABSTRACT: This Generic Requirements document (GR) presents the Telcordia and participating industry representatives' view of information related
to synchronization of telecommunications service providers' digital networks. In general, it is expected to be of use to service
provider personnel (e.g., synchronization coordinators), synchronization product suppliers, and manufacturers of equipment that
interfaces with synchronization products.

This Issue 2 includes significantly more information related to the distribution of Time of Day (ToD) synchronization within networks
and the distribution of synchronization over packet-based networks. It includes:

Revision of text to consistently refer to the set of equipment that provides timing to multiple traffic-carrying Network Elements
(NEs) in a particular site (e.g., a CO) as the BITS clock

Deletion of information related to LORAN signals

Revision of Section 7.3.1 to reflect the fact that Threshold Crossing Alerts (TCAs), not alarms, are generated as part of the
Performance Monitoring (PM) process

Reorganization and modification of the information in Section 2 regarding the need for synchronization in telecommunications
networks

Reorganization of Sections 3 and 4 so that Section 3 focuses on the stratum hierarchy, and Section 4 discusses both intraoffice and
interoffice timing distribution

Addition of text related to a Timing Signal Generator's (TSG?s) possible support of frequency reference output signals other than
the DS1 and CC signals that have traditionally been used in North American applications

A complete revision of Appendix A to reflect the current holdover-related criteria applicable to the various levels of standardized
clocks.